MAX378/MAX379 19-1902 Rev 1 8/94 High-Voltage, Fault-Protected Analog Multiplexers General Description Features Fault Input Voltage 75V with Power Supplies Off The MAX378 8-channel single-ended (1-of-8) multiplexer and the MAX379 4-channel differential (2-of-8) multiplexer Fault Input Voltage 60V with 15V Power Supplies use a series N-channel/P-channel/N-channel structure to All Switches Off with Power Supplies Off provide significant fault protection. If the power supplies to On Channel Turns OFF if Overvoltage Occurs on the MAX378/MAX379 are inadvertently turned off while Input or Output input voltages are still applied, all channels in the muxes Only Nanoamperes of Input Current Under All are turned off, and only a few nanoamperes of leakage cur- Fault Conditions rent will flow into the inputs. This protects not only the No Increase in Supply Currents Due to Fault MAX378/MAX379 and the circuitry they drive, but also the Conditions sensors or signal sources that drive the muxes. Latchup-Proof Construction The series N-channel/P-channel/N-channel protection structure has two significant advantages over the simple Operates from 4.5V to 18V Supplies current-limiting protection scheme of the industrys first- All Digital Inputs are TTL and CMOS Compatible generation fault-protected muxes. First, the Maxim protec- Low-Power Monolithic CMOS Design tion scheme limits fault currents to nanoamp leakage values rather than many milliamperes. This prevents dam- age to sensors or other sensitive signal sources. Second, Ordering Information the MAX378/MAX379 fault-protected muxes can withstand a continuous 60V input, unlike the first generation, which PART TEMP. RANGE PIN-PACKAGE had a continuous 35V input limitation imposed by power MAX378CPE 0C to +70C 16 Plastic DIP dissipation considerations. MAX378CWG 0C to +70C 24 Wide SO All digital inputs have logic thresholds of 0.8V and 2.4V, MAX378CJE 0C to +70C 16 CERDIP ensuring both TTL and CMOS compatibility without requir- MAX378C/D 0C to +70C Dice** ing pull-up resistors. Break-before-make operation is MAX378EPE -40C to +85C 16 Plastic DIP guaranteed. Power dissipation is less than 2mW. MAX378EWG -40C to +85C 24 Wide SO MAX378EJE -40C to +85C 16 CERDIP Applications MAX378MJE -55C to +125C 16 CERDIP Data Acquisition Systems MAX378MLP -55C to +125C 20 LCC* Industrial and Process Control Systems Ordering Information continued at end of data sheet. Avionics Test Equipment * Contact factory for availability. Signal Routing Between Systems **The substrate may be allowed to float or be tied to V+ (JI CMOS). Pin Configurations TOP VIEW A0 1 A1 A0 1 A1 16 16 EN 2 EN 2 15 A2 15 GND V- 3 V- 3 14 GND 14 V+ IN1 IN1A 4 MAX378 13 V+ 4 MAX379 13 IN1B IN2 5 12 IN5 IN2A 5 12 IN2B IN3 6 11 IN3A 6 11 IN6 IN3B IN4 7 10 IN4A 7 10 IN7 IN4B OUT 8 9 OUTA 8 9 IN8 OUTB DIP DIP Pin Configurations continued at end of data sheet. Maxim Integrated Products 1 Call toll free 1-800-998-8800 for free samples or literature.High-Voltage, Fault-Protected Analog Multiplexers ABSOLUTE MAXIMUM RATINGS Voltage between Supply Pins..............................................+44V Continuous Current, IN or OUT...........................................20mA V+ to Ground ...................................................................+22V Peak Current, IN or OUT V- to Ground......................................................................-22V (Pulsed at 1ms, 10% duty cycle max) ............................40mA Digital Input Overvoltage: Power Dissipation (Note 1) (CERDIP) ................................1.28W V+......................................................................+4V Operating Temperature Range: V , V EN A V- ........................................................................-4V MAX378/379C.....................................................0C to +70C Analog Input with Multiplexer Power On..............................65V MAX378/379E ..................................................-40C to +85C Recommended V+ .....................................+15V MAX378/379M ...............................................-55C to +125C Power Supplies V- .......................................-15V Storage Temperature Range .............................-65C to +150C Analog Input with Multiplexer Power Off..............................80V Note 1: Derate 12.8mW/C above T = +75C A Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (V+ = +15V, V- = -15V VAH (Logic Level High) = +2.4V, VAL (Logic Level Low) = +0.8V, unless otherwise noted.) 0C to +70C -55C to +125C and PARAMETER SYMBOL CONDITIONS TEMP UNITS -40C to +85C MIN TYP MAX MIN TYP MAX STATIC +25C 2.0 3.0 2.0 3.5 V = 10V, I = 100A OUT IN ON Resistance r k DS(ON) V = 0.8V, V = 2.4V AL AH Full 3.0 4.0 3.0 4.0 +25C -0.5 0.03 0.5 -1.0 0.03 1.0 V = 10V, V = 10V IN OUT OFF Input Leakage Current I nA IN(OFF) V = 0.8V (Note 6) EN Full -50 50 -50 50 +25C -1.0 0.1 1.0 -2.0 0.1 2.0 V = 10V, V = 10V OUT IN OFF Output Leakage Current I V = 0.8V MAX378 Full -200 200 -200 200 nA OUT(OFF) EN (Note 6) MAX379 Full -100 100 -100 100 +25C -10 0.1 10 -20 0.1 20 V = V = 10V IN(ALL) OUT ON Channel Leakage Current I V = V = 2.4V MAX378 Full -600 600 -600 600 nA OUT(ON) AH EN V = 0.8V (Note 5) MAX379 AL Full -300 300 -300 300 Analog Signal Range V (Note 2) Full -15 +15 -15 +15 V AN Differential OFF Output MAX379 only I Full -50 50 -50 50 nA DIFF Leakage Current (Note 6) FAULT +25C 20 20 nA Output Leakage Current V = 0V, V = 60V OUT IN I OUT(OFF) (with Input Overvoltage) (Notes 3, 4) Full 10 20 A Input Leakage Current V = 60V, V = 10V IN OUT I +25C 25 40 A IN(OFF) (with Overvoltage) (Notes 3, 4) Input Leakage Current V = 75V, V = V = 0V IN EN OUT I +25C 10 20 A IN(OFF) (with Power Supplies Off) A = A = A = 0V or 5V 0 1 2 CONTROL Input Low Threshold V (Note 4) Full 0.8 0.8 V AL Input High Threshold VAH (Note 4) Full 2.4 2.4 V Input Leakage Current I V = 5V or 0V (Note 5) Full -1.0 1.0 -1.0 1.0 A A A (High or Low) 2 MAX378/MAX379